hao0610 2011-03-07 13:51
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java+flex怎么上传文件

java和flex通讯使用的BlazeDs组件.怎么实现flex+java的上传功能,后台使用的是hibernate+spring,没有使用servlet. 最好能写出例子,谢谢!

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  • shilei22 2011-03-09 09:54
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    关于flex上传功能的实现依赖于FileReference类。该类实例对象的创建有两种方法:使用var myFileReference = new FileReference(); FileReferenceList.browse()。使用browse()或者FileReference.browse()方法可以打开上传窗口。
    下面部分资源来自互联网,一个简单的上传组件代码,包括了监听ProgressEvent,选择的selectEvent和完成的completeEvent。为了避免硬编码,将urlRequest路径配置在一个xml里面,使用了httpservice进行请求,将结果用于UrlRequest的参数。这个HttpService采用了resultFormat="e4x",那么要求返回来值为XML类型的

    Flex上传需要两个包apache common fileupload.jar和apache common io.jar
    下载地址
    http://jakarta.apache.org/commons/fileupload/
    http://commons.apache.org/io/download_io.cgi

    upload.mxml
    Xml代码

    <?xml version="1.0" encoding="utf-8"?>

    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
    creationComplete="init()">

    <fx:Declarations>  
        <!-- 将非可视元素(例如服务、值对象)放在此处 -->  
        <mx:HTTPService id="httpService" resultFormat="e4x"/>     
    </fx:Declarations>  
    
    <fx:Script>  
        <![CDATA[ 
            import mx.rpc.events.FaultEvent;    
            import mx.rpc.events.ResultEvent;    
            import flash.net.FileReference;    
            import mx.controls.Alert;    
            import mx.events.CloseEvent;    
            import flash.events.*;    
    
            private var file:FileReference;    
    
            private var filePath:String="";    
            private function init():void   
            {    
                Security.allowDomain("*");    
                file=new FileReference();    
                file.addEventListener(ProgressEvent.PROGRESS, onProgress);    
                file.addEventListener(Event.SELECT, onSelect);    
                file.addEventListener(Event.COMPLETE,fileUploadCompleteHandler);    
    
                httpService.url="config.xml";    
                httpService.showBusyCursor=true;    
                httpService.send();    
                httpService.addEventListener(ResultEvent.RESULT,hsResultHandler);    
                httpService.addEventListener(FaultEvent.FAULT,hsFaultHandler);    
            }    
    
            private function hsResultHandler(e:ResultEvent):void{    
                var xml:XML=e.result as XML;    
                filePath=xml.filepath.@path;    
            }    
    
            private function hsFaultHandler(e:FaultEvent):void{    
                Alert.show(e.fault.toString(),'http请求错误');    
            }    
    
            private function fileUploadCompleteHandler(e:Event):void{    
                Alert.show("上传完成");    
                vBox.removeChild(bar);    
            }    
    
            private function upload():void   
            {    
                var imageTypes:FileFilter=new FileFilter("Images (*.jpg, *.jpeg, *.png)", "*.jpg;*.jpeg;*.png");    
                var docFilter:FileFilter = new FileFilter("Documents", "*.pdf;*.doc;*.txt"); 
                //var viewFilter:FileFilter = new FileFilter("Views", "*.avi;*.flv;*.rmvb"); 
                var allTypes:Array=new Array(imageTypes,docFilter);    
                //              file.browse(allTypes);    
                file.browse();    
            }    
    
            private function onSelect(e:Event):void   
            {    
                Alert.show("上传 " + file.name + " (共 " + Math.round(file.size) + " 字节)?", "确认上传", Alert.YES | Alert.NO, null, proceedWithUpload);    
            }    
    
            private function onProgress(e:ProgressEvent):void   
            {    
                lbProgress.text=" 已上传 " + e.bytesLoaded + " 字节,共 " + e.bytesTotal + " 字节";    
                var proc:uint=e.bytesLoaded / e.bytesTotal * 100;    
                bar.setProgress(proc, 100);    
                bar.label="当前进度: " + " " + proc + "%";    
            }    
    
            private function proceedWithUpload(e:CloseEvent):void   
            {    
                if (e.detail == Alert.YES)    
                {    
                    var request:URLRequest=new URLRequest(filePath);    
                    try   
                    {    
                        file.upload(request);    
                    }    
                    catch (error:Error)    
                    {    
                        trace("上传失败");    
                    }    
    
                }    
            }    
    
    
        ]]>  
    </fx:Script>  
    
    
    <mx:Canvas width="100%"    
               height="100%"    
               x="10"    
               y="170"    
               fontSize="15">     
        <mx:VBox width="100%"    
                 horizontalAlign="center" id="vBox">     
            <mx:Label id="lbProgress"    
                      text="上传"/>     
            <mx:ProgressBar id="bar"    
                            labelPlacement="bottom"    
                            minimum="0"    
                            visible="true"    
                            maximum="100"    
                            label="当前进度: 0%"    
                            direction="right"    
                            mode="manual"    
                            width="200"/>     
    
            <mx:Button label="上传文件"    
                       click="upload();"/>     
        </mx:VBox>     
    </mx:Canvas>     
    

    /s:Application

    config.xml

    Xml代码

    <?xml version="1.0" encoding="UTF-8"?>





    UploadServlet

    Java代码

    package com.test.upload;

    import java.io.File;

    import java.io.IOException;

    import java.io.PrintWriter;

    import java.util.Iterator;

    import java.util.List;

    import javax.servlet.ServletException;

    import javax.servlet.http.HttpServlet;

    import javax.servlet.http.HttpServletRequest;

    import javax.servlet.http.HttpServletResponse;

    import org.apache.commons.fileupload.FileItem;

    import org.apache.commons.fileupload.FileUploadException;

    import org.apache.commons.fileupload.disk.DiskFileItemFactory;

    import org.apache.commons.fileupload.servlet.ServletFileUpload;

    public class FileUploadServlet extends HttpServlet {

    // 定义文件的上传路径

    private String uploadPath = "c:\";

    // 限制文件的上传大小

    private int maxPostSize = 10000000 * 1024 * 1024;

    protected void processRequest(HttpServletRequest request,  
            HttpServletResponse response) throws ServletException, IOException {  
        System.out.println("Access !");  
        System.out.println(uploadPath);  
        // 防止中文乱码  
        request.setCharacterEncoding("utf-8");  
        response.setContentType("text/html;charset=UTF-8");  
        PrintWriter out = response.getWriter();  
        // 保存文件到服务器中  
        DiskFileItemFactory factory = new DiskFileItemFactory();  
        factory.setSizeThreshold(4096);  
        ServletFileUpload upload = new ServletFileUpload(factory);  
        upload.setSizeMax(maxPostSize);  
        try {  
            List fileItems = upload.parseRequest(request);  
            Iterator iter = fileItems.iterator();  
            while (iter.hasNext()) {  
                FileItem item = (FileItem) iter.next();  
                if (!item.isFormField()) {  
                    String name = item.getName();  
                    System.out.println(name);  
                    try {  
                        item.write(new File(uploadPath + name));  
                        // SaveFile s = new SaveFile();  
    
                        // s.saveFile(name);  
    
                    } catch (Exception e) {  
                        e.printStackTrace();  
                    }  
                }  
            }  
        } catch (FileUploadException e) {  
            e.printStackTrace();  
            System.out.println(e.getMessage() + "结束");  
        }  
    }  
    
    protected void doGet(HttpServletRequest request,  
            HttpServletResponse response) throws ServletException, IOException {  
        this.doPost(request, response);  
    }  
    
    protected void doPost(HttpServletRequest request,  
            HttpServletResponse response) throws ServletException, IOException {  
        processRequest(request, response);  
    }  
    

    }

    最后,说一下Flex的FileFilter 的用法
    FileFilter 类用于指示在调用 FileReference.browse() 方法、FileReferenceList.browse() 方法或调用 File、FileReference 或 FileReferenceList 对象的 browse 方法时显示的文件浏览对话框中显示用户系统上的哪些文件。FileFilter 实例作为可选 typeFilter 参数的值传递给该方法。如果使用 FileFilter 实例,则会滤除 FileFilter 实例中未指定的扩展名和文件类型,即用户无法选择这些类型。如果未向方法传递任何 FileFilter 对象,则对话框中将显示所有文件。
    可以采用以下两种方式之一使用 FileFilter 实例:
    仅包含 文件扩展名的描述
    包含 文件扩展名和 Macintosh 文件类型的描述
    这两种格式不能在一个 browse 方法调用中互换。必须使用其中一种格式。
    可以向 browse 方法传递一个或多个 FileFilter 实例,如下所示:
    var imagesFilter:FileFilter = new FileFilter("Images", "*.jpg;*.gif;*.png");
    var docFilter:FileFilter = new FileFilter("Documents", "*.pdf;*.doc;*.txt");
    var myFileReference:FileReference = new FileReference();
    myFileReference.browse([imagesFilter, docFilter]);
    或者在 AIR 应用程序中:
    var imagesFilter:FileFilter = new FileFilter("Images", "*.jpg;*.gif;*.png");
    var docFilter:FileFilter = new FileFilter("Documents", "*.pdf;*.doc;*.txt");
    var myFile:File = new File();
    myFile.browseForOpen("Open", [imagesFilter, docFilter]);
    var imagesFilter = new air.FileFilter("Images", "*.jpg;*.gif;*.png");
    var docFilter = new air.FileFilter("Documents", "*.pdf;*.doc;*.txt");
    var myFile = new air.File();
    myFile.browseForOpen("Open", [imagesFilter, docFilter]);
    FileFilter.extension 属性中的扩展名列表用于筛选文件浏览对话框中显示的文件。该列表实际并不显示在对话框中;若要对用户显示文件类型,必须在描述字符串以及扩展名列表中列出文件类型。

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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